Ussingite is a colorful member of the Sodalite group usually showing a light pink or violet hue. It was named after Niels Viggo Ussing who was a professor of mineralogy at University of Copenhagen. Most Ussingite, despite the pretty color, is translucent at best, and I've only seen a few facetted stones of this extremely rare material This stone is amazingly translucent and has a pleasing purplish-pink color with a standard Trillion cut. Another great rare gem to add to your collection.